diff --git a/libwccl/CMakeLists.txt b/libwccl/CMakeLists.txt
index c7044f66831026723fe989de3704a19fd553b433..398687b30d54b1d6f83d93eb91965c32245be8e4 100644
--- a/libwccl/CMakeLists.txt
+++ b/libwccl/CMakeLists.txt
@@ -16,6 +16,7 @@ set(LIBS ${LIBS} ${Boost_LIBRARIES})
 SET(libwccl_STAT_SRC
 	exception.cpp
 	main.cpp
+	ops/predicate.cpp
 	sentencecontext.cpp
 	values/bool.cpp
 	values/position.cpp